mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 Mohs scale; Color: Brass-yellow (pale); Luster: Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Poor/Indistinct; Specific Gravity: 4.95-5.10

Hardness: 6-6
Color: Brass-yellow (pale)
Luster: Metallic

Identified July 5, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs scale; Color: Brass-yellow (pale); Luster: Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Poor/Indistinct; Specific Gravity: 4.95-5.10

Formation & geological history

Formed in a wide variety of geological settings including hydrothermal veins, as an accessory mineral in igneous rocks, in metamorphic rocks, and as a replacement mineral in sedimentary rocks and fossils. It is often found associated with quartz.

Uses & applications

Historically a source of sulfur for sulfuric acid production; currently used in lithium batteries, as a semiconductor, and widely as a collector specimen and in costume jewelry.

Geological facts

Known as 'Fool's Gold' because its color misled gold prospectors. It is the most common sulfide mineral. Under certain conditions, it can spark when struck against steel, which led to its use in wheel-lock firearms.

Field identification & locations

Identify by its cubic crystal habit, high hardness (it can scratch glass, unlike gold), and its greenish-black streak. Common in mining districts worldwide, such as Rio Tinto, Spain and Huanzala, Peru.